> camera {
>
>      #declare xS = 0;
>      #declare yS = 1;
>      #declare zS = 0;
>      up<xS,yS,zS>
>      right x*image_width/image_height
>
>      angle 1
>      location<0,0,-2000>
>      look_at (Position - 9*x)
> }
> .....
> light_source {                    // far enough to avoid problems ...
>    0
>    color White
>    translate<20000, 30000, -10000>
> }
>
> For zCam<= -1958.5 or zCam>= 2003.5, all the defects in my scene (where there
> are other SORs, affected by the same problem) are gone.
>
> Gilles
>
>
>
>
>
>

You place your camera at a large distance and use a very small angle 
that effectivelt removes perspective. That, in turn, can cause 
calculation errors. Those errors will cause the apearance of various 
artefacts.

Try placing your camera closer and use the orthographic projection. It 
effectively simulate a camera set at infinity.


Alain

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